I believe the answer would still be 0 because 1/3 of 0 is 0
The best and most correct answer among the choices provided by your question is the fourth choice or letter D.
We can imply from the given points that the figure is four-side or a quadrilateral.
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The answer is 450ml so hope this helps all of you who had this problem

is continuous over its domain, all real

.
Meanwhile,

is defined for real

.
If

, then we have

as the domain of

.
We know that if

and

are continuous functions, then so is the composite function

.
Both

and

are continuous on their domains (excluding the endpoints in the case of

), which means

is continuous over

.